Plugin only works when logged in as admin

Hi,
Thanks for the great plugin. It works really well when logged in as admin but when i log out it no longer works. I am using Pagelines DMS as my framework.
You can see it (not) in action here https://www.kyle-irving.co.uk/what-we-do/website-design-and-development/ fixed widget ticked. and here using widget id https://www.kyle-irving.co.uk/what-we-do/.

Any ideas?

thanks

https://www.ads-software.com/plugins/q2w3-fixed-widget/